fix(deps): update dependency @mdxeditor/editor to v2.20.6

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@mdxeditor/editor (source)	2.20.5 -> 2.20.6

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Release Notes

mdx-editor/editor (@​mdxeditor/editor)

### [`v2.20.6`](https://togithub.com/mdx-editor/editor/releases/tag/v2.20.6) [Compare Source](https://togithub.com/mdx-editor/editor/compare/v2.20.5...v2.20.6) ##### Bug Fixes - always keep a paragraph below the last decorator ([083f6fd](https://togithub.com/mdx-editor/editor/commit/083f6fdd2b5fbc92ecb45ecf232403f161c8d537)), closes [#​420](https://togithub.com/mdx-editor/editor/issues/420)

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